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Elina [12.6K]
2 years ago
9

#14, what is this answer ?

Mathematics
1 answer:
trapecia [35]2 years ago
5 0

Answer:

option 3

Step-by-step explanation:

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Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 99​% confidenc
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Answer: 18

Step-by-step explanation:

The formula to find the minimum sample size is given by :_

n=(\dfrac{z^*\cdot \sigma}{E})^2

, where \sigma = population standard deviation.

z*= critical z-value.

E= Margin of error.

Given : \sigma= 13

E= ± 8

We know that critical value corresponding to 99% confidence level = z*=2.576  [Using z-table]

Then, the required sample size would be :

n=(\dfrac{(2.576)\cdot (13)}{8})^2

\Rightarrow\ n=(4.186)^2

\Rightarrow\ n=17.522596\approx18 [Round to next integer.]

Hence, the required minimum sample size = 18

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3 years ago
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Step-by-step explanation:

They share the same straight line and their degrees add to 180

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If there are 40 boys and 60 girls in a room, fill out all of the possible ratios of boys to girls that could be made.
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